Victoria Beckham is selling 600 items from her wardrobe to support an HIV charity.

The fashion designer announced she would auction the 600 pieces for mothers2mothers, which aims to cut the transmission of HIV and AIDS between mothers and their children.

It's been led by Annie Lennox's husband Dr Mitch Besser and supported by stars including Anna Wintour, who encouraged Victoria to visit some of the charity's Mentor Mothers in South Africa earlier this year.

"Whoever you are, wherever you're from, whatever your financial or health status, you are still a woman and you are still a mother and we have a responsibility to support each other. There is always that connection; I certainly felt it," Victoria explained to British magazine Grazia.

The trip had a big effect on the designer and made her determined to help. She also called on her husband, soccer star David Beckham, for support. He is known for his work in the charity sector, which Victoria has come to appreciate more and more.

"David is a huge inspiration, not just because he's my husband and the most amazing father, but he also does an enormous amount to give back, more than anyone knows. I wanted to talk to him about my experiences as I knew he would understand.

"You see things differently on the ground. You meet the mothers, grandparents and the fathers. You meet the kids. I learn so much from David, as he does from me," she explained.

"[This is] just the beginning. I've realised I have a voice and people will listen to me. That's a powerful tool, which, used responsibly, can make a difference."